Captain Kangaroo is a children’s TV series which aired weekday mornings on
the CBS television network for nearly 30 years, from Monday October 3,1955
until December 8, 1984, making it the longest-running children’s television
program of its day. The show was conceived and the title character played
by Bob Keeshan who was the original Clarabell the Clown on The Howdy
Doody Show on NBC.

Show opening from the 1960s

Keeshan as Clarabell the Clown with puppet Howdy and Buffalo Bob
Smith from The Howdy Doody Show.